The post-colonialist academic discourse blames colonialism for the marginalisation of Sharī‘a in the legal systems of Sunnī Muslim-majority countries. However, an analysis of some juristic debates around the Sunnī doctrinal theories of uṣūl al-fiqh and maqāṣid al-sharīʿa exposes few of the theories’ internal problems accounting for the marginalisation. In uṣūl al-fiqh, disputes regarding ijmāʿ and qiyās virtually bring their effectiveness as legal doctrines for positive law legislation to a halt. With regard to maqāṣid al-sharīʿa, an Ašʿarī adherence to a literal reading of the text reduces its potential to produce new Sharī‘a-compliant laws. Such problems render uṣūl al-fiqh and maqāṣid al-sharīʿa ineffective instruments for regulating accelerated legal changes demanded by fast-paced societal and scientific developments and deem the application of Sharīʿa in Sunnī Muslim-majority countries a task neither possible nor even recommended.